[33.07] New Results on X-ray Halos around Nearby edge-on Disk Galaxies

AAS 200th meeting, Albuquerque, NM, June 2002
Session 33. Gaseous Galaxy Halos and Edges of Disk Galaxies
Topical Session Oral, Tuesday, June 4, 2002, 8:30-10:00am, 10:45am-12:30pm, 2:00-3:30pm, 3:45-5:30pm, Ballroom A

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[33.07] New Results on X-ray Halos around Nearby edge-on Disk Galaxies

Q. D. Wang (University of Massachusetts)

I will review recent results from X-ray observations of hot gaseous halos around nearby edge-on disk galaxies. We have detected a giant diffuse X-ray-emitting corona around the galactic disk of NGC 4631. Extraplanar diffuse X-ray emission is also detected around NGC 3556. These X-ray-emitting coronae morphologically resemble the radio halos of these galaxies, indicating a close connection between outflows of hot gas, cosmic rays, and magnetic field from the galactic disks. There is also marginal evidence for extraplanar diffuse X-ray emission in NGC 4244 --- a galaxy with an extremely low star formation rate. In general, the extraplanar diffuse X-ray emission is evidently related to recent massive star forming activities in the galactic disks, especially in their central regions.

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